?? cart.java
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package webwork.examples.i18n;import java.util.ArrayList;import java.util.List;/** * This code is an adaptation of the I18N example from the JavaWorld article by Govind Seshadri. * http://www.javaworld.com/javaworld/jw-03-2000/jw-03-ssj-jsp_p.html */public class Cart { List items; public void addItem(CD cd, int quantity) { if (items == null) items = new ArrayList(); for (int i = 0; i < items.size(); i++) { CartItem ci = (CartItem)items.get(i); if (cd.equals(ci.cd)) { ci.addQuantity(quantity); return; } } items.add(new CartItem(cd, quantity)); } public void removeItem(CD cd) { for (int i = 0; i < items.size(); i++) { CartItem ci = (CartItem)items.get(i); if (cd.equals(ci.cd)) { items.remove(ci); if (items.size() == 0) items = null; return; } } } public List getItems() { return items; } public double getTotal() { double total = 0; for (int i = 0; i < items.size(); i++) { CartItem ci = (CartItem)items.get(i); total += ci.getCd().getPrice() * ci.getQuantity(); } return total; } static public class CartItem { int qty; CD cd; CartItem(CD cd, int qty) { this.cd = cd; addQuantity(qty); } public void addQuantity(int qty) { this.qty += qty; } public int getQuantity() { return qty; } public CD getCd() { return cd; } }}?? 快捷鍵說明
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